selftests/bpf: CONFIG_LIRC required for test_lirc_mode2.sh

test_lirc_mode2.sh assumes presence of /sys/class/rc/rc0/lirc*/uevent
which will not be present unless CONFIG_LIRC=y

Fixes: 6bdd533cee ("bpf: add selftest for lirc_mode2 type program")
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/1590147389-26482-3-git-send-email-alan.maguire@oracle.com

tools/testing/selftests/bpf/config

@@ -38,3 +38,4 @@ CONFIG_IPV6_SIT=m
 CONFIG_BPF_JIT=y
 CONFIG_BPF_LSM=y
 CONFIG_SECURITY=y
+CONFIG_LIRC=y